The toothpaste aisle at a large store that sells personal care products contains many versions of toothpaste produced by a small number of sellers. This indicates that toothpaste producers are best categorized as who engage in .

Aneighborhood home owners association suspects that the recent appraisal values of the houses in the neighborhood conducted by the county government for taxation purposes is too high. it hired a private company to appraise the values of ten houses in the neighborhood. the results, in thousands of dollars, are?